Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Le 18/12/2012 10:30, Andreas Kurz a écrit : > That's quite a lot ... you also tuned vm.dirty_background_bytes and > vm.dirty_bytes to a reasonable low value? .... to avoid regular heavy > data write-out.... Regards, Andreas I'd look into this too, although with the given config and the default 10% threshold for background writes of dirty pages, it should kick in for ~12 Gbytes of dirty. Let's say 120 Gbits get sent over the 20Gb/s link, that clean all up in a few seconds shouldn't it ? I hope I'm not just adding noise, but if the kernel is old enough, there are cases where the write load is high enough for a sync operation to never end. Maybe that affects you? In any case, it's worth running a "watch grep dirty /proc/vmstat" while the i/o block : if the cleaner is kicking in, nr_dirty should decrease down to almost zero. If it goes down an up again and again, maybe the write load is too high for a sync() to finish. Lionel Sausin